Presented at the NADP Technical Meeting and Scientific Symposium October 16, 2008
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1 Future Climate Scenarios, Atmospheric Deposition and Precipitation Uncertainty Alice B. Gilliland, Kristen Foley, Chris Nolte, and Steve Howard Atmospheric Modeling Division, National Exposure Research Laboratory Office of Research and Development, U.S. Environmental Protection Agency Presented at the NADP Technical Meeting and Scientific Symposium October 16, Photo image area measures 2 H x 6.93 W and can be masked by a collage strip of one, two or three images. The photo image area is located 3.19 from left and 3.81 from top of page. Each image used in collage should be reducedor cropped to a maximum of 2 high, stroked with a 1.5 pt white frame and positioned edge-to-edge with accompanying images Office of Research and Development National Exposure Research Laboratory, Atmospheric Modeling Division
2 Future Climate and Atmospheric Deposition? Precipitation changes are fundamental to modeling climate impacts on wet deposition of aerosols Yet, future precipitation changes are more uncertain than trends in temperature (see IPCC Fourth Assessment Report) How do regional climate scenarios vary for future precipitation? Compare 2 existing model datasets available for this presentation 1. Regional downscaling climate scenario used in the EPA/ORD/NERL CIRAQ air quality simulations 1 of 6 climate and air quality simulations in EPA/ORD interim assessment report: 2. NOAA Geophysical Fluid Dynamics Laboratory (GFDL) CM2.1 global climate model 50km grid resolution North American Regional Climate Change Assessment Program (NARCCAP): Compare to NADP and PRISM precipitation data (
3 Background Information for CIRAQ Scenarios Regional Downscaling Climate Scenarios developed by PNNL MM5 regional simulations: Leung and Gustafson, GRL, 2004; Gustafson and Leung, BAMS, 2005 NASA GISS II simulations provided initial and boundary conditions, GHGs: Mickley et al., 2004 IPCC SRES A1B GHG scenario USEPA/ORD/NERL developed regional air quality simulations using these regional climate scenarios Community Multiscale Air Quality model simulations: Nolte et al., JGR Atm., 2008 Given the large uncertainties in future precipitation and climate change, focus has been on ozone impacts from climate Next slide shows example of the results from this study
4 Future vs. Current CMAQ Max. Daily 8hr O 3 (MDA8) : June August Mean Mean MDA8 O3 (ppb), Jun-Aug (Current) Change (future-current) in mean Jun-Aug MDA8 O3, Future = A1B Climate 2001 anthropogenic emissions 2-5 ppb increase in TX, eastern U.S.; comparable decreases in Midwest, PNW Nolte, Gilliland, Hogrefe, and Mickley, J. Geophys. Res., 2008.
5 Background Information for GFDL Scenarios NOAA Geophysical Fluid Dynamics Laboratory (GFDL) CM2.1 global climate model timeslice developed as part of the North American Regional Climate Change Assessment Program (NARCCAP) GFDL CM2.1 timeslice used 2º 2.5º CM2.1 GCM simulation and nested a 50km 50km resolution global simulation for and A series of regional climate simulations using mesoscale models (e.g., WRF) are under development All timeslice and regional downscaling experiments are relying on the IPCC SRES A2 scenario Using GFDL timeslice results available now from NARCCAP, next slide compares precipitation from GFDL, CIRAQ, and observations under current climate
6 PRISM data information: ( )
7 Regional Climate Scenarios PRISM Observations Differences in 5 year accumulated precipitation (cm) CIRAQ regional climate scenarios have larger biases in Southeast and Western Coast than GFDL timeslices Large overpredictions west coast primarily occur in winter months ( ) Underprediction biases in southeast primarily occur in summer months How would wet deposition estimates from CIRAQ study have changed with different precipitation (current climate)?
8 Adjustment of SO 4 Wet Deposition as function of Precipitation Precipitation Ratio: PRISM/CIRAQ Precipitation Ratio: GFDL/CIRAQ Simple adjustment: [5-yr accumulated SO 4 deposition * Precipitation Ratio] Compare to NADP SO 4 wet deposition measurements Use precipitation adjustment ratio from both PRISM and also GFDL GFDL timeslice evaluated better against PRISM Crude estimate wet deposition under different future climate scenarios Could help to select regional climate scenarios for air quality modeling
9 (cm) (kg/ha) How do these 3 compare against NADP SO 4 wet deposition?
10 NADP vs CIRAQ SO 4 NADP vs NADP/CIRAQ Precip. Adjusted SO 4 NADP vs GFDL/CIRAQ Precip. Adjusted SO 4 Difference (NADP Model)
11 Using the simple adjustment against PRISM precipitation, SO 4 deposition estimates have lower RMSE in most regions.
12 Using the GFDL 5-year accumulated precipitation ( ) for the precipitation adjustment of SO 4 deposition leads to modestly lower RMSE in most regions.
13 The adjustment helps to reduce spread of model-obs differences Bias can be larger in some cases after adjustment (Northeast) Will apply a similar method for sulfate deposition in current vs. future climate Results for NO 3 and NH 4 deposition more mixed; will just focus here on SO 4 5-yr average, annual accumulated totals for now
14 How do the two Future Current precipitations compare? 5-yr average of accumulated annual precipitation (cm) CIRAQ regional climate scenario has large increases in future precipitation in the Southeast, localized large decrease in southeast TX GFDL timeslice scenario does not show similar increases in the Southeast, larger increases in precipitation in localized areas of California
15 Adjustment Ratio 5-yr Current: GFDL/CIRAQ precipitation Adjustment Ratio 5-yr Future: GFDL/CIRAQ precipitation GFDL/CIRAQ precipitation ratios are very similar under current and future (2050) CIRAQ drier in Eastern US and CO, NM, AZ, WY CIRAQ wetter along Gulf coast, CA coast, and upper Midwest Ratios are applied to CMAQ SO 4 wet deposition for current and future simulations and then compared (future-current )
16 Future Current Precipitation (5-yr average, annual accumulated, cm) CIRAQ GFDL Future Current SO 4 Deposition (5-yr average, annual accumulated, kg/ha)
17 Future Current Precipitation CIRAQ GFDL Future Current SO 4 Deposition Some spatial correlation between changes in precipitation and SO 4 deposition. Very different patterns in future precipitation change (GFDL vs CIRAQ). SO 4 deposition changes are drastically different in Southeast and upper Midwest
18 Summary and Conclusions Predicted precipitation changes are fundamental to model estimates of nutrient wet deposition changes Future changes in precipitation (related to climate change) are very uncertain To develop more confidence in how future climate may change wet deposition of aerosols, a range of future scenarios is needed Ensemble regional-scale climate scenarios (e.g., NARCCAP) can help to assess what precipitation changes may be expected Using simple adjustment methods and existing model estimates of sulfate deposition (and other efficiently scavenged species?) can be tested with various future precipitation scenarios In parallel, further development and evaluation of regional climate scenarios will continue for air quality and future climate studies
19 Acknowledgements NARCCAP: Seth McGinnis for providing the GFDL timeslice experiments, Isaac Held and Bruce Wyman from GFDL for generating the GFDL timeslice simulations PNNL: Ruby Leung and Bill Gustafson for generating the CIRAQ regional climate downscaling scenarios. Harvard University: Loretta Mickley for generating the GISS II GCM and ozone chemistry results for the CIRAQ regional downscaling and chemical boundary conditions Disclaimer: Although this work was reviewed by EPA and approved for publication, it may not necessarily reflect official Agency policy
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